CN111945568A - Temporary limiting structure and method for arc-shaped tower body ultra-wide steel box girder cable-stayed bridge tower beam - Google Patents
Temporary limiting structure and method for arc-shaped tower body ultra-wide steel box girder cable-stayed bridge tower beam Download PDFInfo
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- CN111945568A CN111945568A CN202010802566.1A CN202010802566A CN111945568A CN 111945568 A CN111945568 A CN 111945568A CN 202010802566 A CN202010802566 A CN 202010802566A CN 111945568 A CN111945568 A CN 111945568A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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Abstract
The invention discloses a temporary limiting structure and a temporary limiting method for a tower beam of a cable-stayed bridge with an arc-shaped tower body and an ultra-wide steel box beam, wherein the limiting structure comprises a plurality of limiting devices and conversion supporting blocks, a bracket supporting structure is arranged at the beam end of each limiting device, a rigid shoveling cushion block is arranged between each bracket supporting structure and each conversion supporting block, and a supporting bracket is arranged below each conversion supporting block; the beam end bracket comprises a beam end supporting panel, a beam end stiffening plate, a reinforcing web plate and a transverse clapboard; the conversion supporting block comprises a curved arc lining plate, a tower end stiffening plate and a tower end supporting panel. According to the invention, the limiting bracket, the conversion supporting block and the rigid shoveling cushion block are welded, and the remaining gap value is used as a tower beam limiting device, so that the steel box beam and the curved tower body of the main tower are effectively connected and load is transferred, the purpose of longitudinal limiting is realized, and the operation procedures of structural system conversion and constraint release after the bridge is formed are optimized; the device has the advantages of simple structure, clear stress, convenient manufacture, good applicability, simple and convenient operation, low investment cost, good popularization prospect and the like.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a temporary limiting structure and a temporary limiting method for a tower beam of an arc-shaped tower body ultra-wide steel box beam cable-stayed bridge, which are mainly used for restraining the longitudinal displacement of the bridge caused by unbalanced horizontal force generated in a steel beam cantilever erection construction stage, a bridge deck pavement construction stage and a cable debugging stage of a large-span ultra-wide steel box beam cable-stayed bridge.
Background
The most similar technical scheme tower beam temporary limiting measure at present:
1) the invention discloses a three-way temporary consolidation structure of a tower beam of a large-span cable-stayed bridge, and relates to the three-way temporary consolidation structure of the tower beam of the large-span cable-stayed bridge. The vertical temporary consolidation of the invention adopts a prestressed anchor cable to stretch and anchor the bottom of the steel box girder and the bottom of the cross beam. The transverse beam between the main towers is used for rooting, the defect that the width of a bridge deck of the steel beam is limited to be smaller than the precondition that the distance between two tower limbs is small is overcome, the requirements on the longitudinal rigidity resistance and the transverse width resistance of the transverse beam are high (the transverse rigidity resistance and the transverse width resistance can occupy the space and time for installing the support), and in addition, when the longitudinal limit is released, the problem of high safety risk exists in the process of cutting the temporary consolidation structure.
2) CN 206625120U _ A temporary locking structure for tower beam of semi-floating body system steel box beam cable-stayed bridge, comprising pier column, beam body and tower column; the tower column penetrates through the beam body along the vertical direction, the lower end of the beam body is fixed on the pier column, and cross beams are arranged on the tower column at the two sides of the beam body in the transverse direction; a plurality of groups of temporary locking devices are arranged between the beam and the beam body. The temporary locking device comprises a steel base anchored on a bottom plate of the beam body and a temporary cushion stone fixed on the upper end face of the beam, the steel base is fixedly connected with the temporary cushion stone in the vertical direction through a tensioning structure, and a horizontal sliding resistant structure enabling the steel base and the temporary cushion stone to have friction coefficients not less than 0.45 in the transverse bridge direction and the forward bridge direction is arranged between the lower end face of the steel base and the upper end face of the temporary cushion stone. According to the technical scheme, the longitudinal limit utilizes a vertical fixing device and a vertical effective load, and the longitudinal unbalance effect is resisted by means of friction force, so that the defect that the longitudinal load value is limited only by the friction force, the requirement on the longitudinal limit load value cannot be too large, and otherwise, the longitudinal limit fails; longitudinal loads are transmitted to the main tower structure through the cross beams (the cantilever and the midspan area), a force transmission path is complex, and the longitudinal loads are not directly transmitted to the main tower structure more simply. In addition, when the longitudinal limit is released, the temporary consolidation structure is cut, so that the problem of great safety risk exists.
In the construction process of cantilever erection of the ultra-wide steel box girder (bridge deck width B > tower limb interval L), the cable-stayed bridge is easy to cause the bridge to generate longitudinal deviation because of the large length of the cantilever and poor structural stability and simultaneously influenced by factors such as environmental factors (wind, temperature and the like) and construction load, and the longitudinal temporary limit is required to be implemented on the bridge for ensuring the safety and stability of the structure in the construction process. After the steel box girder closure is completed, the operation of a bridge deck pavement layer is carried out, the horizontal component force of the stay cables on the two sides of the bridge tower is unevenly distributed due to asymmetric load generated by two constant loads, the main tower and the main bridge are longitudinally deviated, and the longitudinal temporary limit is required to be arranged on the position of the tower girder of the cable-stayed bridge in order to ensure the safety and stability of the main tower and the main bridge structure. The tower body structure is characterized by being arc-shaped, and if the longitudinal limiting arrangement is unreasonable, the problem that the tower body structure of the main tower is easy to be unevenly and intensively loaded is solved, and special conversion treatment needs to be carried out on the arc-shaped tower body structure to ensure the uniform stress of the tower body. In addition, the longitudinal limiting function needs to synchronously solve the technical problems of structural system conversion and limiting unloading, and avoids the technical problem that the limiting load bears the horizontal cable force difference of non-middle-span and side-span.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a temporary limiting structure and a temporary limiting method for a tower beam of an arc-shaped tower body ultra-wide steel box girder cable-stayed bridge, and optimizes the operation procedures of structural system conversion and constraint release after the bridge is formed; the device has the advantages of simple structure, clear stress, convenient manufacture, good applicability, simple and convenient operation, low investment cost, good popularization prospect and the like.
The invention discloses a temporary limiting structure of a tower beam of an arc-shaped tower body ultra-wide steel box girder cable-stayed bridge, which comprises a tower body, a steel box girder, a steel
The device comprises a plurality of limiting devices and conversion supporting blocks, wherein a bracket supporting structure is arranged at the beam end of each limiting device, a rigid lifting cushion block is arranged between each bracket supporting structure and each conversion supporting block, and a supporting bracket is arranged below each conversion supporting block;
the beam end bracket comprises a beam end supporting panel, a beam end stiffening plate, a reinforcing web plate and a transverse clapboard;
the conversion supporting block comprises a curved arc lining plate, a tower end stiffening plate and a tower end supporting panel;
a gap is reserved between the tower end stiffening plate and the tower end support panel, the gap is filled with the rigid shoveling block, and a rubber buffer cushion block is arranged between the rigid shoveling block and the tower body support panel;
the compression deformation delta (including the inelastic compression gap value) between the tower end stiffening plate and the tower end support panel meets the following formula:
in the formula, SInThe cable force value of the No. i stay cable in the span of the main beam is obtained; cos θInThe included angle between the No. i cable of the main span of the main beam and the main beam is set; sSide iThe cable force value of the i-th stay cable of the side span of the main beam is obtained; cos θSide iThe included angle between the No. i inhaul cable of the side span of the main beam and the main beam is set; l is1The spacing distance is longitudinal spacing along the bridge span direction; EA is the compressive rigidity of the steel beam in the spacing interval, and the fact that longitudinal spacing only bears the difference value of horizontal component force of the middle span and the side span is guaranteed.
Further, a clearance of 400-500 mm is reserved between the tower end stiffening plate and the tower end supporting panel.
Further, the thickness of the rubber cushion block is 30-50 mm.
The invention also discloses a temporary limiting method for the tower beam of the cable-stayed bridge with the ultra-wide steel box beam on the arc-shaped tower body, which uses the temporary limiting structure for the tower beam of the cable-stayed bridge with the ultra-wide steel box beam on the arc-shaped tower body and comprises the following steps:
when the steel box girder cable-stayed bridge is erected to the cantilever stage, 1 limiting device is respectively arranged at the top plate and the bottom plate of the front and rear steel box girder sections of the main tower longitudinal bridge, 2 limiting devices are arranged on one side of the single limb of the main tower, and the distance between the front limiting device and the rear limiting device is L1；
A certain width range is reserved in the corresponding position of the reinforcing web plate by the limiting device of the bottom plate for later use position placement of the hydraulic jack, so that the purpose of controllable unloading is realized; injecting high-strength mortar into a gap between the curved arc lining plate and the arc tower body for filling and compacting;
when the steel box girders are closed, the second-stage dead load pavement is finished and the stay cables are finally and precisely adjusted, two hydraulic jacks are placed at the reserved positions of the bottom plate limiting device, and the total jacking force of the two hydraulic jacks is not less than 1.2
Starting a jack to perform system conversion, and removing a limiting device at the position of the top plate by using the compression deformation delta;
before the steel beam support is installed in place, reading the horizontal load difference value N through a jack1Checking N in design State2And actual N1And (4) unloading the load of the jack after the steel beam support is installed in place and anchored, gradually converting the longitudinal load of the tower beam to the fixed support of the main bridge, removing the temporary limiting device, and then removing the limiting device at the positions of the jack and the bottom plate.
Preferably, the limiting devices are arranged at the front steel box girder and the rear steel box girder of the longitudinal bridge to the main tower, the top plate and the bottom plate are symmetrically arranged at one position and are arranged at the upstream and the downstream, and the single-tower cable-stayed bridge is provided with 4 limiting devices.
Preferably, the reinforcing webs are adjusted according to the spacing of the existing webs in the steel box girder, and the reinforcing web spacing is 3/5 of the width of the single-side tower limb.
Preferably, the curved arc lining plate is arranged according to the shape of the arc tower body to ensure contact and close contact, and the gap is not more than 5 mm.
Preferably, the jack is only arranged on the limiting device at the bottom plate at the lower side of the steel box girder, and when the second-stage dead load construction of the main bridge is completed and the stay cable is adjusted, the jack is started to remove the limiting device at the top plate at the upper side of the steel box girder.
Preferably, after the support is installed, adjusted and anchored by grouting, the support completely participates in a full-bridge stress system, the jack is slowly released, and the limiting device at the bottom plate on the lower side of the steel box girder is detached.
Preferably, when the jack is driven, the jack is pressed or released step by step in a sectional manner so as to ensure the safety and stability of the steel box girder bridge structure.
Has the advantages that:
firstly, the structure is simple: the limiting structure mainly comprises four parts, namely a beam end bracket, a tower end conversion supporting block, a middle shoveling pad and a supporting bracket;
secondly, safety and reliability: the device adopts elastic buffer to restrain and limit, can adapt to the longitudinal load total effect which is only the difference value delta F of the horizontal component force of the middle-span and side-span inhaul cables, and also adapt to the deformation effect generated by the temperature change of the beam body; the conversion supporting shoe can effectively adapt to the curved surface shape of the tower body, ensures that the limiting device is stably and effectively arranged between the tower body and the box girder, ensures uniform stress on the surface of the curved bridge body, and ensures the safety of the bridge structure.
Thirdly, the installation and the removal are convenient: each part of the device can be manufactured into a unit to be integrally installed, a hydraulic jack is used for system conversion, the dismounting procedure of the limiting device is optimized, the construction difficulty of cutting is reduced, and the construction period can be effectively shortened.
Fourthly, the popularization prospect is good: the simple and convenient and fast limiting method is provided for the construction of bridges with similar structures, the applicability is strong, the superior technical advantages are displayed, and the popularization prospect is good.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic elevation view of the temporary stop of the present invention.
Fig. 2 is a schematic plan view of the temporary position-limiting device of the present invention.
FIG. 3 is a schematic view of a beam end corbel of the present invention.
FIG. 4 is a schematic view of the transition support block of the present invention.
Reference numerals:
in the drawings, 1-beam end support panel; 2-beam end stiffening plate; 3-corbel transverse partition board; 4-a reinforcing web; 5-bending the arc lining plate; 6-tower end stiffening plate; 7-tower end support panels; 8-rubber cushion blocks; 9-rigid shoveling blocks; 10-support the bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention will now be further described with reference to the accompanying drawings.
In order to achieve the purpose of longitudinal limiting, the steel box girder and the curved-surface type tower body of the main tower are effectively connected and load is transferred by welding the limiting bracket, the conversion supporting block and the rigid shoveling cushion block and keeping a gap value as a tower girder limiting device, and the method is as follows.
Referring to fig. 1 to 4, after the steel box girder cable-stayed bridge is erected to the cantilever stage, 1 limiting devices are respectively installed at the top and bottom plate positions of the front and rear steel box girder sections of the main tower longitudinal bridge, 2 limiting devices are arranged at one side of a single limb of the main tower, and the distance between the front and rear limiting devices is L1. The beam end of the limiting device is of a bracket supporting structure, the tower body is provided with a conversion supporting block adaptive to the radian of the tower body, and the conversion supporting block is arranged belowA support bracket 10 is arranged, and a rigid shoveling cushion block 9 is arranged between the bracket support structure and the conversion support block.
Specifically, the beam-end corbel support structure mainly comprises a beam-end support panel 1, a beam-end stiffening plate 2, a reinforcing web plate 3 and a diaphragm plate 4;
the conversion supporting block at the tower body mainly comprises a curved arc lining plate 5, a tower end stiffening plate 6 and a tower end supporting panel 7.
And a gap of 400-500 mm is reserved between the tower end stiffening plate 6 and the tower end support panel 7, the gap is filled by using a rigid shoveling block 9, a rubber buffer block 8 with the thickness of 30-50 mm is arranged between the rigid shoveling block 9 and the tower end support panel 7 to increase the gap value of 10mm, and the compression deformation delta (including the inelastic compression gap value) between the tower end stiffening plate 6 and the tower end support panel 7 needs to meet the following formula.
In the formula SInThe cable force value of the No. i stay cable in the span of the main beam is obtained; cos θInThe included angle between the No. i cable of the main span of the main beam and the main beam is set; sSide iThe cable force value of the i-th stay cable of the side span of the main beam is obtained; cos θSide iThe included angle between the No. i inhaul cable of the side span of the main beam and the main beam is set; l is1The spacing distance is longitudinal spacing along the bridge span direction; EA is the compressive rigidity of the steel beam in the spacing interval, and the fact that longitudinal spacing only bears the difference value of horizontal component force of the middle span and the side span is guaranteed.
Wherein, the stop device of bottom plate reserves certain width scope in 3 corresponding positions of reinforcing web and places hydraulic jack service position as the later stage, realizes the purpose of controllable uninstallation.
In order to ensure that the limiting device is well attached to the tower body and is evenly stressed, high-strength mortar is injected into a gap possibly existing between the curved arc lining plate 5 and the arc-shaped tower body to be densely filled.
When the steel box girders are closed, the second-stage dead load pavement is finished and the stay cables are finally and precisely adjusted, 2 hydraulic jacks are placed at the reserved positions of the bottom plate limiting device, and the total jacking force of the two hydraulic jacks is not less than 1.2
And (5) starting the jack to perform system conversion, and removing the limiting device at the top plate position by using the compression deformation delta in the step two.
Before the steel beam support is installed in place, reading the horizontal load difference value N through a jack1Checking N in design State2And actual N1Magnitude of the value. After the steel beam support is installed in place and anchored, the load of the jack is unloaded in five stages, the longitudinal load of the tower beam is gradually converted to the fixed support of the main bridge, temporary limiting is relieved, and then the limiting devices at the positions of the jack and the bottom plate are dismantled.
In the embodiment of the invention, the limiting devices are arranged at the front steel box girder and the rear steel box girder of the longitudinal bridge to the main tower, the top plate and the bottom plate are arranged at one position and are symmetrically arranged at the upstream and the downstream, and the single-tower cable-stayed bridge is provided with 4 limiting devices.
In the embodiment of the invention, the corbel supporting structure at the beam end is connected with the top (bottom) plate of the steel box beam by welding through the beam end stiffening plate 2 and is connected to the existing inner side web plate of the steel box beam by the reinforcing web plate 4, and the corbel supporting structure is effectively connected into a whole by welding. The conversion supporting block is closely attached to the tower body of the main tower, and a supporting structure 10 is arranged at the position of the tower body below the supporting block to prevent the supporting block from falling off.
The approximately-curved arc lining plate 5 can be finely processed according to the size of the arc-shaped tower body, and is leveled by filling high-strength mortar, so that the effect that the conversion supporting block is completely attached to the tower body is achieved, the limiting device is guaranteed to achieve the expected using effect, and the arc-shaped tower body is uniformly stressed.
The rubber cushion blocks 8 and the clearance value of 10mm are arranged, so that certain elastic cushion capacity of the limiting device is increased, the impact force generated by limiting can be effectively buffered, and the problem that the limiting load bears the horizontal cable force difference value of non-middle-span and side-span is solved.
The jack can be effectual substitutes or breaks away from main bridge atress system with stop device, participates in the system conversion process as required, is convenient for demolish stop device, reduces stop device and demolishs the risk.
When the jack is driven, the jack is gradually pressed or released in a sectional grading way, so that the safety and stability of the steel box girder bridge structure are ensured
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A temporary limiting structure of a tower beam of an arc-shaped tower body ultra-wide steel box beam cable-stayed bridge is characterized in that,
the device comprises a plurality of limiting devices and conversion supporting blocks, wherein a bracket supporting structure is arranged at the beam end of each limiting device, a rigid lifting cushion block is arranged between each bracket supporting structure and each conversion supporting block, and a supporting bracket (10) is arranged below each conversion supporting block;
the beam end bracket comprises a beam end supporting panel (1), a beam end stiffening plate (2), a reinforcing web plate (3) and a transverse clapboard (4);
the conversion supporting block comprises a curved arc lining plate (5), a tower end stiffening plate (6) and a tower end supporting panel (7);
a gap is reserved between the tower end stiffening plate (6) and the tower end supporting panel (7), the gap is filled with the rigid shoveling block (9), and a rubber buffer block (8) is arranged between the rigid shoveling block (9) and the tower body supporting panel (7);
the compression deformation delta between the tower end stiffening plate (6) and the tower end supporting panel (7) meets the following formula:
in the formula, SInThe cable force value of the No. i stay cable in the span of the main beam is obtained; cos θInThe included angle between the No. i cable of the main span of the main beam and the main beam is set; sSide iThe cable force value of the i-th stay cable of the side span of the main beam is obtained; cos θSide iThe included angle between the No. i inhaul cable of the side span of the main beam and the main beam is set; l is1The spacing distance is longitudinal spacing along the bridge span direction; EA is the compressive rigidity of the steel beam in the spacing interval, and the fact that longitudinal spacing only bears the difference value of horizontal component force of the middle span and the side span is guaranteed.
2. The temporary limiting structure for the tower beam of the arc-shaped tower ultra-wide steel box girder cable-stayed bridge according to claim 1, wherein a clearance of 400-500 mm is reserved between the tower end stiffening plate (6) and the tower end supporting panel (7).
3. The temporary limiting structure of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge tower girder according to claim 1, wherein the rubber cushion block (8) is 30-50 mm thick.
4. A temporary limiting method for a tower beam of an arc-shaped tower body ultra-wide steel box girder cable-stayed bridge is characterized by comprising the following steps: the temporary limiting structure for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to any one of claims 1 to 3 comprises the following steps:
when the steel box girder cable-stayed bridge is erected to the cantilever stage, 1 limiting device is respectively arranged at the top plate and the bottom plate of the front and rear steel box girder sections of the main tower longitudinal bridge, 2 limiting devices are arranged on one side of the single limb of the main tower, and the distance between the front limiting device and the rear limiting device is L1；
A certain width range is reserved in the position, corresponding to the reinforcing web (3), of the limiting device of the bottom plate for later use position placement of the hydraulic jack, and the purpose of controllable unloading is achieved; high-strength mortar is injected into a gap between the curved arc lining plate (5) and the arc tower body for filling and compacting;
when the steel box girders are closed, the second-stage dead load pavement is finished and the stay cables are finally and precisely adjusted, two hydraulic jacks are placed at the reserved positions of the bottom plate limiting device, and the total jacking force of the two hydraulic jacks is not less than 1.2
Starting the jack to perform system conversion, useRemoving the limiting device at the top plate position according to the compression deformation delta;
before the steel beam support is installed in place, reading the horizontal load difference value N through a jack1Checking N in design State2And actual N1And (4) unloading the load of the jack after the steel beam support is installed in place and anchored, gradually converting the longitudinal load of the tower beam to the fixed support of the main bridge, removing the temporary limiting device, and then removing the limiting device at the positions of the jack and the bottom plate.
5. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: the limiting device is arranged at the front steel box girder and the rear steel box girder of the longitudinal bridge to the main tower, the top plate and the bottom plate are symmetrically arranged at one position and at the upstream and the downstream, and the single-tower cable-stayed bridge is provided with 4 limiting devices.
6. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: the reinforcing web plates (3) are adjusted according to the distance between the existing web plates in the steel box girder, and the distance between the reinforcing web plates is 3/5 of the width of the single-side tower limb.
7. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: the curved arc lining plate (5) is arranged according to the shape of the arc tower body to ensure that the contact is close to the contact, and the gap is not more than 5 mm.
8. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: the jack is only arranged on a limiting device at the bottom plate at the lower side of the steel box girder, and when the second-stage dead load construction of the main bridge is completed and the stay cable is adjusted, the jack is started to remove the limiting device at the top plate at the upper side of the steel box girder.
9. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: after the support is installed, adjusted and anchored by grouting, the support completely participates in a full-bridge stress system, the jack is slowly released, and the limiting device at the bottom plate at the lower side of the steel box girder is detached.
10. The temporary limiting method for the tower beam of the arc-shaped tower body ultra-wide steel box girder cable-stayed bridge according to claim 4, characterized in that: when the jack is driven, the pressure is gradually applied or released in a sectional grading manner, so that the safety and stability of the steel box girder bridge structure are ensured.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113481846A (en) * | 2021-06-26 | 2021-10-08 | 华设设计集团股份有限公司 | UHPC beam unit for bridge tower, UHPC beam, bridge tower and construction method thereof |
| CN113846561A (en) * | 2021-09-09 | 2021-12-28 | 中铁广州工程局集团有限公司 | Method for erecting 0# steel beam of cable-stayed bridge by adopting temporary stay cable and auxiliary bracket |
| CN114319104A (en) * | 2021-12-13 | 2022-04-12 | 江苏沪宁钢机股份有限公司 | Irregular box-shaped bridge tower node and manufacturing method thereof |
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| CN113846561A (en) * | 2021-09-09 | 2021-12-28 | 中铁广州工程局集团有限公司 | Method for erecting 0# steel beam of cable-stayed bridge by adopting temporary stay cable and auxiliary bracket |
| CN114319104A (en) * | 2021-12-13 | 2022-04-12 | 江苏沪宁钢机股份有限公司 | Irregular box-shaped bridge tower node and manufacturing method thereof |
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